Air carrier flight crew reported receiving a low altitude alert from Tower but they indicated a normal glide path; the flight crew continued the approach and landed safely at the airport.

Narrative

We were on the arrival; course only; in LNAV; getting stepped down by ATC for an anticipated TIP TOE VISUAL for XXL. We were given traffic information about a preceding aircraft (corporate I believe). We were queried if we had the traffic in sight. I did not but I believe the captain did. I indicated that I did in fact have the field in sight and the captain reported that and we were cleared for the visual XXL and to maintain 180k until 5 DME. With the autopilot off; I began to configure from flaps 5 to gear down while descending on a visual path to XXL. At about 1500 AGL with the runway and PAPI in sight; showing 2 red 2 white; we received a call from the tower about a low altitude alert. Puzzled from this as my sight picture with XXL showed a normal visual approach path; along with verification of the 2 red 2 white PAPI indication; we briefly discussed with each other why that alert was presented to us. We then acknowledged the alert with the tower; selected our final landing configuration and landed uneventfully.